EP0435467A2 - Optisches Netzwerk - Google Patents

Optisches Netzwerk Download PDF

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Publication number
EP0435467A2
EP0435467A2 EP90312962A EP90312962A EP0435467A2 EP 0435467 A2 EP0435467 A2 EP 0435467A2 EP 90312962 A EP90312962 A EP 90312962A EP 90312962 A EP90312962 A EP 90312962A EP 0435467 A2 EP0435467 A2 EP 0435467A2
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EP
European Patent Office
Prior art keywords
network
nodes
node
synchronous
coupled
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90312962A
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English (en)
French (fr)
Other versions
EP0435467A3 (en
Inventor
Terry Bricheno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
STC PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by STC PLC filed Critical STC PLC
Publication of EP0435467A2 publication Critical patent/EP0435467A2/de
Publication of EP0435467A3 publication Critical patent/EP0435467A3/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/44—Star or tree networks

Definitions

  • This invention relates to optical networks for the transmission of data between a number of nodes or terminals.
  • Optical systems utilising fibre optic transmission with various network configurations, employing either active or passive couplers and dividers, with both wavelength and time division multiplexing, are being developed at the present time.
  • Uses include broadband overlay for subscriber access networks and ultra-high capacity packet switching for telecommunication or parallel processing computer applications. See for example A. Oliphant "Progress in the development of a digital optical routing system for television studio centres", International Broadcasting Convention IBC 88, Brighton, Sept. 88, IEE Conference Publication No. 293 pp 90-94, D.B. Payne & J.R. Stern “Single mode optical local networks", Conf. Proc. Globecom '85, Houston, paper 39.5 and E. Authurs et al "A fast optical cross connect for parallel processing computers” Proc. 13th European Conference on Optical Communication, Helsinki, Finland, Sept. 1987.
  • the optical receiver in the receiving node In order to make a particular connection between the nodes of such a network the optical receiver in the receiving node must be tuned into the same wavelength as the required transmitter.
  • the switching and reconfiguration of connections in the network can be achieved either by switching the wavelength of transmission with fixed separate wavelength receivers at each node or by using fixed separate wavelength transmitters in each node and switched wavelength receiver.
  • the object of the present invention is to provide an optical network in which the need for terminal demultiplexing is obviated.
  • a synchronous network including a plurality of nodes or terminals each of which is coupled to all the other nodes of the network via a common distribution point, characterised in that each node is coupled to the distribution point by a plurality of similar optical fibres, and that each of said optical fibres carries transmissions from one only of said nodes, the network being such that, in use, signals transmitted by the nodes via the network are synchronous at the common distribution point.
  • a synchronous network including a plurality of nodes or terminals each of which is coupled to all the nodes of the network, including itself, via respective fibre optic paths each of which is routed via a common region, characterised in that each said optical path carries transmissions from one only of said nodes, and that the network is such that, in use, signals transmitted by the nodes via the network are synchronous at the common region.
  • each optical fibre of the network carries transmissions from only one respective system node, the necessity to provide terminal demultiplexing equipment is obviated.
  • Fig. 1 is a general schematic diagram of a synchronous network
  • Fig. 2 illustrates one form of intermodal coupling from the network of Fig. 1
  • Fig. 3 illustrates an alternative form of internodal coupling
  • Fig. 4 shows a typical frame format for transmission of data in the network of Fig. 1.
  • Fig. 5 is a schematic diagram of a node or terminal construction.
  • the synchronous network comprises a number of nodes or terminals 11 interconnected by optical pathways 12 which pathways are routed via a common distribution centre 13. Signals transmitted by any one node are propagated to all the system nodes including the node originating the signal. In the arrangement of Fig. 1, one node is selected as a reference node for timing purposes, and all the other nodes adjust their timing so that all transmissions are synchronous at the common distribution centre 13.
  • Fig. 2 illustrates one embodiment of the network of Fig. 1.
  • each node 11 has a plurality of similar optical transmitters 21, one for each system node including itself.
  • the transmitters 21 are driven in parallel as one coupled each via a respective optical fibre 22 to a common distribution centre 23.
  • the distribution centre 23 has a number of input ports 231 equal to n2 where n is the number of nodes or terminals, and has an equal number of n2 output ports 232, each of which is coupled to a respective input port 231 by a fibre optic coupling 233.
  • Each node 11 also has a plurality of receivers 24, again equal in number to the number of nodes.
  • Each receiver 24 is coupled to a corresponding output port 232 of the distribution centre by an optical fibre 25.
  • the fibres 22 and 25 are coupled to the distribution centre by multiway plug-in connectors.
  • the fibres coupling the transmitters of any one node to the distribution centre, and those fibres coupling the receivers of that node to the distribution centre comprise ribbon fibres.
  • the use of ribbon fibre ensures that the optical distance between each node and the distribution centre is substantially the same for all the node receivers as is similarly substantially the same for all the node transmitters.
  • the perceived signal delays at the receivers of any given node should not vary by more than 1 tenth of a bit period to ensure a high transmission quality. For example, at a bit rate of 1 Gbit/s. the time differential between received signals should not exceed 100 picoseconds.
  • each node 11 has a number of receivers equal to the number of nodes as before, but has only a single transmitter 31 coupled via a single fibre 32 to an n-way splitter 33 where n is the total number of nodes.
  • the splitter is in turn coupled to the distribution centre.
  • each frame contains parallel signals from the system nodes and includes for each node a header providing a time zero reference for the frame, a data packet, node stating information, and frame acknowledgements of previously received frames.
  • Each line of the frame is of course carried in a requisite optical path between the transmitting node and the receiving node.
  • the frames are short in comparison to the time taken for a frame to transit the network.
  • the received data packets within a frame are treated as having been received in a predetermined order according to the source of the packets. This provides each frame with a time stamp order of data packets.
  • Synchronisation of the network may be achieved by the following technique.
  • One system node is selected as a reference node with which all other nodes synchronise their frames.
  • each node determines its distance in frame times from the distribution centre by measuring the delay between transmission and receipt of its own messages. This information is then transmitted to all other system nodes. From this information each node can adjust its timing so that frame synchronisation with frames from the reference node is effected at the distribution centre.
  • a network node or terminal includes optical receivers 51 equal in number to the total number of system nodes.
  • the receivers 51 are coupled each via a respective series/parallel converter 52 to a corresponding first-in-first-out (FIFO) store 53.
  • Read-out in the correct order of messages held in the FIFO stores 53 is controlled via access circuits 54 by a media access control circuit 55.
  • This control circuit 55 also controls the output of transmitted messages stored in a further (output) FIFO store 56 via access circuit 57.
  • the transmitted messages are output to the network via a parallel/series converter 58 and a transmitter 59.
  • a network control circuit 60 synchronises the terminal with the network.
  • the terminal is so arranged that incoming messages are sorted into frame order and, within a frame, sorted into a predetermined order according to their origin.
  • the transmitter 59 of the terminal of Fig. 5 may be replaced by an appropriate number of similar transmitters operated in parallel.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
EP19900312962 1989-12-22 1990-11-29 Optical network Withdrawn EP0435467A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8929014A GB2239365B (en) 1989-12-22 1989-12-22 Optical network
GB8929014 1989-12-22

Publications (2)

Publication Number Publication Date
EP0435467A2 true EP0435467A2 (de) 1991-07-03
EP0435467A3 EP0435467A3 (en) 1992-07-29

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ID=10668389

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900312962 Withdrawn EP0435467A3 (en) 1989-12-22 1990-11-29 Optical network

Country Status (3)

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EP (1) EP0435467A3 (de)
JP (1) JPH06208038A (de)
GB (1) GB2239365B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0580016A2 (de) * 1992-07-23 1994-01-26 Alcatel SEL Aktiengesellschaft Bussystem für ein lokales Operationsnetzwerk
DE19620723A1 (de) * 1996-05-23 1997-11-27 Sel Alcatel Ag Optische Netzwerkeinheit und Zentrale eines optischen Kommunikationsnetzes
US6229933B1 (en) 1997-08-22 2001-05-08 Telefonaktiebolaget Lm Ericsson (Publ) Component for cross-connecting optofibres

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3883222A (en) * 1973-09-07 1975-05-13 Corning Glass Works Coupler for optical communication system
DE3235266A1 (de) * 1982-09-23 1984-03-29 Siemens AG, 1000 Berlin und 8000 München Kopplernetzwerk zum verkoppeln mehrerer teilnehmersender mit mehreren teilnehmerempfaengern

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3883222A (en) * 1973-09-07 1975-05-13 Corning Glass Works Coupler for optical communication system
DE3235266A1 (de) * 1982-09-23 1984-03-29 Siemens AG, 1000 Berlin und 8000 München Kopplernetzwerk zum verkoppeln mehrerer teilnehmersender mit mehreren teilnehmerempfaengern

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
GLOBAL TELECOMMUNICATION CONFERENCE vol. 3, December 1985, NEW YORK pages 1201 - 1205; PAYNE AND STERN: 'Single mode optical local networks' *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0580016A2 (de) * 1992-07-23 1994-01-26 Alcatel SEL Aktiengesellschaft Bussystem für ein lokales Operationsnetzwerk
EP0580016A3 (de) * 1992-07-23 1995-05-24 Sel Alcatel Ag Bussystem für ein lokales Operationsnetzwerk.
DE19620723A1 (de) * 1996-05-23 1997-11-27 Sel Alcatel Ag Optische Netzwerkeinheit und Zentrale eines optischen Kommunikationsnetzes
US6011637A (en) * 1996-05-23 2000-01-04 Alcatel Optical network unit and center of an optical communication network
AU715257B2 (en) * 1996-05-23 2000-01-20 Alcatel Optical network unit
US6229933B1 (en) 1997-08-22 2001-05-08 Telefonaktiebolaget Lm Ericsson (Publ) Component for cross-connecting optofibres

Also Published As

Publication number Publication date
GB8929014D0 (en) 1990-02-28
EP0435467A3 (en) 1992-07-29
GB2239365A (en) 1991-06-26
GB2239365B (en) 1993-10-20
JPH06208038A (ja) 1994-07-26

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